170pc "London Bus" Vertical Panoramic Mini Puzzle. Ages 9+. Since 1891 we've been making the finest puzzles and it's our attention to detail which makes Ravensburger the world's greatest puzzle brand! Experience the quality you can grow with -- piece by piece! Ravensburger puzzle pieces are extra durable to withstand the demands of little hands and promote the development of fine motor skills, association, task completion and independent play.